Raw Oysters

Safety Status: Avoid Entirely

Raw oysters are high-risk foods that must be strictly avoided during pregnancy.

According to warnings from the Centers for Disease Control and Prevention (CDC) and the U.S. Food and Drug Administration (FDA), consuming raw or undercooked shellfish poses a severe threat of foodborne infection to pregnant individuals and their fetuses.

Oysters are filter feeders, meaning they pump large volumes of water through their bodies to extract nutrients.

If the surrounding water contains pathogens—from sewage runoff, warm water temperatures, or natural coastal ecology—the oysters concentrate these bacteria and viruses in their tissues. Eating them raw means ingesting these concentrated pathogens directly.

Key Biological Risks

Consuming raw oysters exposes you to several highly dangerous pathogens:

1. Vibrio vulnificus and Vibrio parahaemolyticus: These bacteria cause vibriosis. While in healthy adults it causes severe diarrhea and vomiting, in pregnant individuals it can lead to septicemia (blood poisoning), which carries a high risk of fetal loss or maternal death.
2. Norovirus: An extremely contagious virus causing acute gastroenteritis. Severe vomiting and diarrhea can lead to maternal dehydration, which can trigger uterine contractions and preterm labor.
3. Hepatitis A: A virus that affects liver function. It can cause severe illness in pregnant women and increase the risk of premature birth.

Safe Seafood Guidelines

You can safely satisfy seafood cravings by ensuring all shellfish is cooked thoroughly:

• Fully Cooked Oysters: Baked oysters (such as Oysters Rockefeller), fried oysters, or oysters in boiled stews are safe to eat, as heat destroys Vibrio and viral pathogens.
• Verify Cooking: Ensure cooked oysters are heated to an internal temperature of 145°F (63°C), or cooked until their shells open wide. Discard any shellfish that does not open during cooking.
• Prevent Cross-Contamination: When dining out, make sure cooked seafood is not prepared on the same surfaces or served with the same ice/utensils used for raw shellfish.